Simple Definition:

Onboarding is the process of integrating and familiarizing new employees [people who have recently been hired to work for a company] into an organization. It involves providing them with the necessary information, training, and resources to become productive and successful in their roles. For example, during the onboarding process, new employees may receive an orientation session [a meeting to introduce them to the company and its policies], be assigned a mentor [an experienced colleague who helps and guides them], and be given access to the company’s systems and tools.

Very Simple Definition:

Onboarding is when a company helps new employees to learn about their job and be ready to work. This can include introducing them to the company, giving them someone to ask questions to, and letting them use the tools they need. For example, when someone starts working at a new place, they may have someone show them around and explain how things work.